linux-kernel - Re: [PATCH 12/13] cpufreq: Add cpufreq driver for Tegra124

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Message-ID: <53BFF132.3020700@nvidia.com>
Date:	Fri, 11 Jul 2014 17:14:10 +0300
From:	Tuomas Tynkkynen <ttynkkynen@...dia.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Mike Turquette <mturquette@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 12/13] cpufreq: Add cpufreq driver for Tegra124



On 11/07/14 07:35, Viresh Kumar wrote:
> Hi Tuomas,
>
> On 11 July 2014 03:12, Tuomas Tynkkynen <ttynkkynen@...dia.com> wrote:
>> Add a new cpufreq driver for Tegra124. Instead of using the PLLX as
>> the CPU clocksource, switch immediately to the DFLL. It allows the use
>> of higher clock rates, and will automatically scale the CPU voltage as
>> well. We also rely on the DFLL driver to determine the CPU clock
>> frequencies that the chip supports, so that we can directly build a
>> cpufreq table with the OPP library helper dev_pm_opp_init_cpufreq_table.
>>
>> This driver is a completely independent of the old cpufreq driver
>> (tegra-cpufreq), which is only used on Tegra20.
>>
>> Signed-off-by: Tuomas Tynkkynen <ttynkkynen@...dia.com>
>
> Please reuse cpufreq-cpu0 instead of adding a new driver. Similar
> is being adopted by all platforms now: krait, mvebu, etc..
>

Sure, I can do the CPU clock parent change first and then instantiate 
the cpufreq-cpu0 driver, like highbank-cpufreq. That'll depend on the 
patch 'cpufreq: cpu0: OPPs can be populated at runtime' from your 
'Extend support beyond CPU0' series though, any idea when that patch 
will land in?


-- 
nvpublic
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